1 The lac operon consists of three structural genes, and a promoter, a terminator, regulator, and an operator. 2  The three structural genes are: lacZ, lacY, and lacA.n this case, when lactose is required as a sugar source for the bacterium, the three genes of the lac operon can be expressed and their subsequent proteins translated: lacZ, lacY, and lacA.
NEC Corporation (æ¥æ¬é»æ°æ ªå¼ä¼ç¤¾, Nippon Denki Kabushiki Gaisha) is a Japanese multinational provider of information technology (IT) services and products, headquartered in Minato, Tokyo, Japan.
The Northeast Corridor (NEC) is an electrified railway line in the Northeast megalopolis of the United States.Owned primarily by Amtrak, it runs from Boston through New York City, Philadelphia, and Baltimore to Washington, D.C.The corridor is used by many Amtrak trains, including the high-speed Acela Express, intercity trains, and several long-distance trains.ost of the corridor also has frequent commuter rail service, operated by the MBTA, Shore Line East, Metro-North Railroad, New Jersey Transit, SEPTA, and MARC. Several companies run freight trains over sections of the NEC.